This tutorial shows how to change your Windows 7 display language.
First,open Control Panel from Start menu–>Click Clock,Language,and Region option–>Click “Change display language”below the Region and language option
then,in this screen click “Install/Uninstall languages”–>”Install display languages”–>”Launch Windows Update”
Click “available optional updates” in following screen
Now,you can select to install your prefer language package in following:
After install the language package,go to the second screenshot and select your language in “Choose a display language” drop-down box.